34 Multislice Imaging and Concatenations

The time needed to excite and spatially encode one slice is referred to as the slice loop time (Fig. 34.1). The repetition time (TR) is defined as the time between two excitation pulses for the same slice and is a major contrast-dictating parameter in MRI. On completion of the encoding of a given slice, there is usually time prior to the next excitation pulse to excite and encode other slices. In this approach, called multislice imaging, the maximum number of slices is given by the repetition time divided by the slice loop time.

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